LM Playground is an Android application for running Large Language Models locally on-device. Download models, load them in one tap, and chat - all offline, all private. Powered by llama.cpp with GGUF-format models from Hugging Face.
- On-device inference - no cloud, no API keys, fully offline
- Rich markdown in chat responses - headers, code blocks, lists, and more
- Reasoning model support - thinking steps from models like GPT-OSS, DeepSeek R1, and Nemotron are displayed in a styled section
- Reliable background downloads - custom download engine with OkHttp and WorkManager, progress notifications with speed and ETA, automatic resume on network interruptions
- Storage management - choose where to keep multi-GB model files with Android's Storage Access Framework
- ARM optimized - KleidiAI kernels and OpenMP for faster generation on arm64 devices
- Large-screen ready - tablets, foldables, and Chromebooks get a permanent sessions sidebar, list-detail Settings, and freeform window resize support
| Family | Sizes | Provider |
|---|---|---|
| GPT-OSS | 20B | OpenAI |
| Qwen 3.5 | 0.8B, 2B, 4B | Alibaba |
| Qwen 3 | 0.6B, 1.7B, 4B | Alibaba |
| Gemma 4 | E2B, E4B, 12B | |
| Gemma 3n | E2B, E4B | |
| Gemma 3 | 1B, 4B | |
| Nemotron 3 Nano | 4B | NVIDIA |
| Granite 4.1 | 3B, 8B | IBM |
| Granite 4.0 | Micro, H-Tiny | IBM |
| DeepSeek R1 Distill | 1.5B, 7B | DeepSeek |
| Phi-4 mini | 3.8B | Microsoft |
| LFM2.5 Thinking | 1.2B | Liquid AI |
| Ministral 3 | 3B, 8B (Instruct & Reasoning) | Mistral |
| Llama 3.2 | 1B, 3B | Meta |
| Llama 3.1 | 8B | Meta |
Legacy models
| Family | Sizes | Provider |
|---|---|---|
| Qwen 2.5 | 0.5B, 1.5B | Alibaba |
| Phi 3.5 mini | 3.8B | Microsoft |
| Mistral v0.3 | 7B | Mistral |
| Gemma 2 | 9B |
Most models use Q4_K_M quantization; Qwen 3.5 uses Q3_K_M, and GPT-OSS ships in its native MXFP4 format. See ModelInfoProvider.kt for the full list.
If you're just looking to install LM Playground, you can find it on Google Play. If you're a developer wanting to contribute, read on.
Prerequisites:
- Android Studio 2024.3.1+
- NDK 27.2.12479018
- CMake 3.31.6
- Clone the repository with submodules:
git clone --recurse-submodules https://github.com/andriydruk/LMPlayground.git
- Open the project in Android Studio:
File>Open> Select the cloned repository. - Connect an Android device or start an emulator.
- Run the application using
Run>Run 'app'or the play button in Android Studio.
This project is licensed under the MIT License.
This project is built on llama.cpp. Models are GGUF-format with Q4_K_M quantization sourced from Hugging Face.
If you have any questions, suggestions, or issues, feel free to open an issue or contact me directly at me@andriydruk.com.